Hello, I have noticed a strange performance regression and I'm at a loss as to what's happening. We have a fairly large database (~16 GB). The original postgres 7.4 was running on a sun v880 with 4 CPUs and 8 GB of ram running Solaris on local scsi discs. The new server is a sun Opteron box with 4 cores, 8 GB of ram running postgres 8.1.4 on Linux (AMD64) on a 4 Gbps FC SAN volume. When we created the new database it was created from scratch rather than copying over the old one, however the table structure is almost identical (UTF8 on the new one vs. C on the old). The problem is queries are ~10x slower on the new hardware. I read several places that the SAN might be to blame, but testing with bonnie and dd indicates that the SAN is actually almost twice as fast as the scsi discs in the old sun server. I've tried adjusting just about every option in the postgres config file, but performance remains the same. Any ideas? Thanks, Alex
